TM 9-243TYPES AND USES - ContinuedDRILL GAGESThe twist drill and drill rod gage has a series of holes withsize and decimal equivalents stamped adjacent to eachhole. One gage measures drill sizes Nos. 1 to 60; theother gage measures drill sizes 1/16 to 1/2 inch in 1/64inch intervals. Drill gages determine the size of a drilland indicate the correct size of drill to use for given tapsize. Drill number and decimal size are also shown inthis type gage. Letter size drill gages are also available.Each drill hole is identified by a letter instead of anumber, decimal, or fraction.MARKING GAGESMarking gages are made of wood or steel. They consistof a graduated beam about 8 inches long on which ahead slides. The head can be fastened at any point onthe beam with a thumbscrew. The thumbscrew pressesa brass shoe tightly against the beam and locks it firmlyin position. A steel pin or spur (1) marks the wood andprojects from the beam about 1/16 inch.A marking gage is used to mark off guidelines parallel toan edge, end, or surface of a piece of wood. It has asharp spur or pin which does the marking. A markinggage must be adjusted by setting the head the desireddistance from the spur.USING A THICKNESS GAGEThickness (feeler) gages are used in one of two ways:as a means for determining a measure or a means foradjusting to a definite limit. A thickness gage is used tocheck piston ring gap clearance in a cylinder bore.A long blade thickness gage is used to determine the fitbetween large mating surfaces. By combining blades itis possible to obtain a wide variation of thickness.16-5
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